505212052661 has 4 divisors (see below), whose sum is σ = 505343178252. Its totient is φ = 505080927072.

The previous prime is 505212052649. The next prime is 505212052699. The reversal of 505212052661 is 166250212505.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 355776460900 + 149435591761 = 596470^2 + 386569^2 .

It is a cyclic number.

It is not a de Polignac number, because 505212052661 - 2¹⁰ = 505212051637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505212058661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65557016 + ... + 65564721.

It is an arithmetic number, because the mean of its divisors is an integer number (126335794563).

Almost surely, 2^505212052661 is an apocalyptic number.

It is an amenable number.

505212052661 is a deficient number, since it is larger than the sum of its proper divisors (131125591).

505212052661 is a wasteful number, since it uses less digits than its factorization.

505212052661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131125590.

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 505212052661 in words is "five hundred five billion, two hundred twelve million, fifty-two thousand, six hundred sixty-one".